perplexus.info :: General : Prime clock

Prime clock (Posted on 2004-08-01)

Given a clock, rearrange six consecutive numbers on its face, so the sum of every pair of adjacent numbers is a prime.

Submitted by Federico Kereki

Rating: 3.7500 (8 votes)

Solution: (Hide)

There are two solutions, both reordering numbers 5 to 10:
1 2 3 4 7 10 9 8 5 6 11 12
1 2 3 4 9 10 7 6 5 8 11 12

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Two solutions	K Sengupta	2024-05-09 00:35:36
not that we need another computer solution	vectorboy	2004-08-12 17:06:32
Solution	Emma	2004-08-06 20:56:02
Solution	matt	2004-08-02 13:51:49
Solution	Gaolman	2004-08-02 11:17:02
re: No Subject	Penny	2004-08-02 06:47:42
No Subject	neshal	2004-08-02 05:25:23
No Subject	Isabel	2004-08-02 04:17:34
re: A question....	Isabel	2004-08-02 04:00:52
A question....	Isabel	2004-08-02 03:57:55
re: maybe	Penny	2004-08-02 00:32:20
maybe	sharon reese	2004-08-02 00:12:57
not a solution	sharon reese	2004-08-01 23:55:45
solved!	sharon reese	2004-08-01 23:26:52
Another computer solution	Penny	2004-08-01 14:30:36
The computer method	Charlie	2004-08-01 11:29:46
trial & error solution	Danny	2004-08-01 10:41:13

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